You need an AirPrinter.
List of supported AirPrinters.
http://support.apple.com/kb/HT4356
--------------------------------------------------------------
I have a need to print to either a wifi HP Photosmart device, or the request was made that I purchase a Bluetooth printer.
Apple does not supply BlueTooth printer drivers for the iPad nor will iOS allow you add print drivers.
Apple provides one dirver for iPad printering that is AirPrinter. That leaves you buying a compatible airprinter or additional software -- iPad applications for printer or more software/hardware elsewhere.
In a corporate environment you can add software to your severs to allow airprint to your existing printers.
Helper app -- /print n share. You cannot add a driver but you can add an app!
Print directly to the widest range of network or WiFi printers available in any app. Alternatively print via your computer to ALL printers including USB & Bluetooth printers. View read and display large PDF, Office & iWork files. Easily transfer & store files from the Cloud or your computer.
https://itunes.apple.com/us/app/print-n-share/id301656026?mt=8
Buy another box
"xPrintServer enables wireless printing for iOS devices such as iPads® and iPhones® using their native print menu. It eliminates the need to print through apps, install software, or email yourself documents for printing. And more importantly, you don't need to buy a new printer because xPrintServer works with more than 4,000 top brand USB and network printers. "
http://www.lantronix.com/it-management/xprintserver/xprintserver.html
You have to check whether this box supports your printer
http://www.lantronix.com/it-management/xprintserver/xprintserver-supported-print ers.php
Software for your computer's printer:
Mac and Windows
http://osxdaily.com/2010/12/01/make-any-printer-airprint-compatible/
For Windows, try: PrintBreau, or PrintCentral.
PrintCentral Pro
http://itunes.apple.com/us/app/printcentral-pro/id426362921?mt=8
Source: https://discussions.apple.com/thread/2729284?start=0&tstart=0